Red vat dye.



nrra sures arr we.

WILHELM BAUER AND ALFRED I-IERR E, OF OPLADEN, NEAR COLOGNE, GERMANY, ASSIGNORS TO SYNTHETIC PATENTS CO., INC., OF NEW YORK, N. Y., A CORPORATION OF NEW YORK.

RED VAT DYE.

No Drawing.

To all whom it may concern:

Be it known that we, \VIIJIELM BAUER and ALFRED Henna, doctors of philosophy, chemists, citizens of theGerman Empire, residing at Opladen, near Cologne, Germany, have invented new and useful Improvements in Red Vat Dye, of which the following is a specification.

The present invention relates to the manufacture and production of new and valuable indigoid vatdyestufls. They can be produced by condensing halogenated derivatives of isatin compounds 6. g. isatins, naphthisatins, in which isatin compounds the oxygen of the alpha-keto group is replaced by an easily movable or replaceable substituent, e. g. anilido group, with a 3- aryl-l-indanon, and more particularly with 3-phenyl-1-indanon having the formula its substitution products or homologues, such as the 3-tolyl-1-indanon.

As alpha derivatives above mentioned can be used c. g. the 5.7 .dichloro-isatin-alphaanilid which yields a pure red while alphaarylamins of the halogenated 2.3-naphthisatins yield very pure violets. The new products are after being dried and pulverized reddish powders soluble in concentrated sulfuric acid generally with a bluish coloration; dyeing cotton from an alkaline hydrosulfite vat generally from red to violet fast shades.

In order to illustrate the new process more fully the following example is given, the parts being by weightz-29l parts of 5.7- dichlo1--. -isatin-alpha-anilid and 220 parts of Patented July 27, 1915.

Application filed October 6, 1914. Serial No. 865.288.

3-phenyl-l-indanon are heated together with 1000 parts of acetic acid anhydrid during 12 hours on the water batl: in a vessel provided with a stirrer. The dye is filtered off, washed with ether and dried. It has most probably the formula:

brownish-red crystals soluble in concentrated sulfuric acid with a pure blue coloration. \Vith hydrosulfite and caustic soda. lye a yellow vat is obtained dyeing cotton pure rhodamin-red fast shades.

' We claim 1. The herein described new indigoid vat dyestuffs being derived from an alpha derivative of a halogen substituted isatin compound and a 3-aryl-1-indanon, which are after being dried and pulverized reddish powders soluble in concentrated sulfuric acid generally with a bluish coloration; and dyeing cotton from an alkaline hydrosulfite vat generally from red to violet fast shades, substantially as described.

2. The new indigoid vat dyestufl' having most probably the formula:

which is after being dried and pulverized a brownish-red crystalline compound soluble set our hands in the presence of two subin concentrated sulhlrlc acid w1th a pure scrlbing Witnesses.

blue coloration; yielding with hydrosulfite WILHELM BAUER.

and caustic soda lye a yellow vat dyeing ALFRED HERRE. 5 cotton pure rhodamin-red fast shades, sub- Witnesses:

stantially as described. J. D. ZmsEoKEY,

In testimony whereof we have hereunto. LEO SCHOENTHAL. 

